Mailing envelope



FIG. 1 is a front, elevation view of a mailing envelope showing my new design; and,

FIG. 2 is a front, elevation view of a mailing envelope showing a second embodiment of my new design.

The surface(s) or portion(s) of the article not shown in the drawing or described in the specification form(s) no part of the claimed design. 

The ornamental design for mailing envelope, as shown and described. 